Graph Migration from c++ to c#

Question

Hi Below is the code which is used for drawing a graph in the winforms using C++ Kindly let us know the correct conversion for drawing the same graph using C# in a picturebox pDC->MoveTo(xy+int(height*10/11)); pDC->LineTo(x+int(wid)y+int(height*10/11));

Vulpes · Answer

That's because the upper left hand corner of the picturebox is considered to be the origin (00) for drawing purposes. Points with negative co-ordinates will therefore be outside the picturebox. You'll need to translate your co-ordinates so that they all fall within the positive xy quadrant in order to draw them within the picturebox.

Ensoi · Answer

Hi Thanks for your quick reply. The idea worked out for positive values of x&y. We have one more clarification i.e. if y is -ve the line is not getting plotted inside the picturebox. Kindly let us know how to set the -ve value in picture box

Vulpes · Answer

It's difficult to translate these fragments in isolation but as the C++ code appears to be drawing a vertical line 10/11ths of the way down from the origin try this: private void pictureBox1_Paint(object sender PaintEventArgs e) { int x = 0 y = 0; // say int height = pictureBox1.Size.Height; int wid = pictureBox1.Size.Width; Point pt1 = new Point(x y + (int)((float)height * 10 / 11)); Point pt2 = new Point(x + wid y + (int)((float)height * 10 / 11)); e.Graphics.DrawLine(Pens.Black pt1 pt2); }